Dim line terminators when they're not hovered
Dim line terminators when they're not hovered

Currently line terminators are slightly brighter than the rest of
the line that's deselected. Fix that.

alphagov/spotlight,keithiopia/spotlight,tijmenb/spotlight,keithiopia/spotlight,keithiopia/spotlight,tijmenb/spotlight,alphagov/spotlight,alphagov/spotlight,tijmenb/spotlight